I believe the moisture content of the soil helps the conductivity of the soil to "carry" and increases the penetration of the signals from the machine. Some mineralization (on the salt side, not iron) combined with good moisture will give you unbelievable depth. The same as some beaches. And all though the lack of moisture will rob some of your depth, it also stops the iron mineralization from over whelming your machine to a certain degree. Some guys will swear that the silver signals seem to "pop" out in dry conditions and are easier to hear. So a drought gives you an awesome time to experiment with much larger coils that you normally couldn't use in such highly mineralised soils and also might give an opportunity to go back to some iron infested sites. In that situation though it is important to turn your gain down to at least seven and probably run in auto sensitivity to reduce false signals. Dry, "irony" soil seems to cause lots of falsing, but so does extremely saturated soils with too large a coil. Dry soil can be overcome by using larger coils and tweaking your settings, wet soil can be over come by using smaller coils and tweaking your settings. The problem with soils is that there are so many different variables, moisture is just one of them and the easiest to identify, it is hard to go out with one set strategy. A quick rule of thumb is if you aren't getting coins or quality targets at 8 inches, you need to adjust your settings and/or change coils until you do. There are some sites that are so dry and so mineralised that you might max out at 6 inches depth, but many another brand of machine will either max out at 4 inches depth or just not work, period. In your soil, in it's drought state, maybe the ML won't help you much without knowing how to tweak and push it, that's difficult for the "experts" never mind a guy just opening a box. Your other option is to try and hunt in long grass areas or forest canopy, where the soils will have a tad bit more moisture than the unshaded areas of a park.